Module: Apricot::Compiler

Defined in:
lib/apricot/compiler.rb

Constant Summary collapse

SELF = 
Identifier.intern(:self)

Class Method Summary collapse

Class Method Details

.bytecode(g, form, quoted = false, macroexpand = true) ⇒ Object 



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# File 'lib/apricot/compiler.rb', line 91

def bytecode(g, form, quoted = false, macroexpand = true)
  pos(g, form)

  case form
  when Identifier
    if quoted
      g.push_const :Apricot
      g.find_const :Identifier
      g.push_literal form.name
      g.send :intern, 1
    else
      if form.constant?
        g.push_const form.const_names.first
        form.const_names.drop(1).each {|n| g.find_const n }
      elsif form == SELF
        g.push_self
      elsif form.qualified?
        QualifiedReference.new(form.unqualified_name, form.qualifier).bytecode(g)
      else
        g.scope.find_var(form.name).bytecode(g)
      end
    end

  when Seq
    if quoted || form.empty?
      g.push_const :Apricot
      g.find_const :List

      if form.empty?
        g.find_const :EMPTY_LIST
      else
        form.each {|e| bytecode(g, e, true) }
        g.send :[], form.count
      end
    else
      callee, args = form.first, form.rest

      # Handle special forms such as def, let, fn, quote, etc
      if callee.is_a?(Identifier)
        if special = SpecialForm[callee.name]
          special.bytecode(g, args)
          return
        end

        if macroexpand
          form = Apricot.macroexpand(form)

          if form.is_a?(Seq)
            # Avoid recursing and macroexpanding again if expansion returns a list
            bytecode(g, form, false, false)
          else
            bytecode(g, form)
          end

          return
        end

        meta = callee.meta

        # Handle inlinable function calls
        if meta && meta[:inline] && (!meta[:'inline-arities'] ||
                                     meta[:'inline-arities'].apricot_call(args.count))
          begin
            inlined_form = meta[:inline].apricot_call(*args)
          rescue => e
            g.compile_error "Inliner function for '#{callee.name}' raised an exception:\n  #{e}"
          end

          g.tail_position = false
          bytecode(g, inlined_form)
          return
        end

        if callee.fn? || callee.method?
          qualifier_id = Identifier.intern(callee.qualifier.name)
          first_name, *rest_names = qualifier_id.const_names

          g.push_const first_name
          rest_names.each {|n| g.find_const(n) }

          args.each {|arg| bytecode(g, arg) }
          g.send callee.unqualified_name, args.count
          return
        end
      end

      # Handle everything else
      g.tail_position = false
      bytecode(g, callee)
      args.each {|arg| bytecode(g, arg) }
      g.send :apricot_call, args.count
    end

  when Symbol
    g.push_literal form

  when Array
    form.each {|e| bytecode(g, e, quoted) }
    g.make_array form.size

  when String
    g.push_literal form
    g.string_dup # Duplicate string to prevent mutating the literal

  when Hash
    # Create a new Hash
    g.push_const :Hash
    g.push form.size
    g.send :new_from_literal, 1

    # Add keys and values
    form.each_pair do |key, value|
      g.dup # the Hash
      bytecode(g, key, quoted)
      bytecode(g, value, quoted)
      g.send :[]=, 2
      g.pop # drop the return value of []=
    end

  when Fixnum
    g.push form

  when true
    g.push :true

  when nil
    g.push :nil

  when false
    g.push :false

  when Float
    g.push_unique_literal form

  when Regexp
    once(g) do
      g.push_const :Regexp
      g.push_literal form.source
      g.push form.options
      g.send :new, 2
    end

  when Rational
    once(g) do
      g.push_self
      g.push form.numerator
      g.push form.denominator
      g.send :Rational, 2, true
    end

  when Set
    g.push_const :Set
    g.send :new, 0 # TODO: Inline this new?

    form.each do |elem|
      bytecode(g, elem, quoted)
      g.send :add, 1
    end

  when Bignum
    g.push_unique_literal form

  else
    g.compile_error "Can't generate bytecode for #{form} (#{form.class})"
  end
end

.compile_and_eval_file(file) ⇒ Object 



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# File 'lib/apricot/compiler.rb', line 40

def compile_and_eval_file(file)
  cc = generate(Reader.read_file(file), file, 1, true)

  if Rubinius::CodeLoader.save_compiled?
    compiled_name = Rubinius::ToolSet::Runtime::Compiler.compiled_name(file)

    dir = File.dirname(compiled_name)

    unless File.directory?(dir)
      parts = []

      until dir == "/" or dir == "."
        parts << dir
        dir = File.dirname(dir)
      end

      parts.reverse_each do |d|
        Dir.mkdir d unless File.directory?(d)
      end
    end

    Rubinius::ToolSet::Runtime::CompiledFile.dump cc, compiled_name,
      Rubinius::Signature, Rubinius::RUBY_LIB_VERSION
  end

  cc
end

.compile_form(form, file = "(eval)", line = 1) ⇒ Object 



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# File 'lib/apricot/compiler.rb', line 68

def compile_form(form, file = "(eval)", line = 1)
  generate([form], file, line)
end

.eval(code, file = "(eval)", line = 1) ⇒ Object 



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# File 'lib/apricot/compiler.rb', line 76

def eval(code, file = "(eval)", line = 1)
  forms = Reader.read_string(code, file,line)

  return nil if forms.empty?

  forms[0..-2].each do |form|
    eval_form(form, file, line)
  end

  # Return the result of the last form in the program.
  eval_form(forms.last, file, line)
end

.eval_form(form, file = "(eval)", line = 1) ⇒ Object 



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# File 'lib/apricot/compiler.rb', line 72

def eval_form(form, file = "(eval)", line = 1)
  Rubinius.run_script(compile_form(form, file, line))
end

.generate(forms, file = "(none)", line = 1, evaluate = false) ⇒ Object 



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# File 'lib/apricot/compiler.rb', line 5

def generate(forms, file = "(none)", line = 1, evaluate = false)
  g = Generator.new
  g.name = :__apricot__
  g.file = file.to_sym

  g.scopes << TopLevelScope.new

  g.set_line(line)

  if forms.empty?
    g.push_nil
  else
    forms.each_with_index do |e, i|
      g.pop unless i == 0
      bytecode(g, e)

      # We evaluate top level forms as we generate the bytecode for them
      # so macros can be used immediately after their definitions.
      eval_form(e, file) if evaluate
    end
  end

  g.ret

  scope = g.scopes.pop
  g.local_count = scope.local_count
  g.local_names = scope.local_names

  g.close
  g.encode
  cc = g.package(Rubinius::CompiledCode)
  cc.scope = Rubinius::ConstantScope.new(Object)
  cc
end

.once(g) {|g| ... } ⇒ Object

Some literals, such as regexps and rationals, should only be created the first time they are encountered. We push a literal nil here, and then overwrite the literal value with the created object if it is nil, i.e. the first time only. Subsequent encounters will use the previously created object. This idea was copied from Rubinius::AST::RegexLiteral.

The passed block should take a generator and generate the bytecode to create the object the first time.

Yields:

  • (g) 


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# File 'lib/apricot/compiler.rb', line 266

def once(g)
  idx = g.add_literal(nil)
  g.push_literal_at idx
  g.dup
  g.is_nil

  lbl = g.new_label
  g.gif lbl
  g.pop

  yield g

  g.set_literal idx
  lbl.set!
end

.pos(g, form) ⇒ Object 



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# File 'lib/apricot/compiler.rb', line 282

def pos(g, form)
  if (meta = form.apricot_meta) && (line = meta[:line])
    g.set_line(line)
  end
end